<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon>
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <el-form :model="addForm" ref="addFormRef" :rules="addFormRules" label-width="100px" label-position="top">
        <!-- tab栏区域 -->
        <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name" >
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number" ></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight" >
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number" >
              <el-input v-model="addForm.goods_number" type="number" ></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                expand-trigger="hover"
                :options="catelist"
                :props="cateProps"
                v-model="addForm.goods_cat"
                @change="handleChange">
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="(item) in manyTabDate" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i">
                </el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="(item) in onlyTabDate" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- cation 表示图片要上传的后台api地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button class="addBtn" type="primary" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'
export default {
  data() {
    return{
      // 步骤条激活选项的id
      activeIndex:0,
      // 添加商品的表单数据对象
      addForm:{
        goods_name:'',
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        // 商品所属分类数组
        goods_cat:[],
        // 图片的数组
        pics:[],
        // 商品的详情描述
        goods_introduce:'',
        attrs:[]
      },
      // 表单验证规则
      addFormRules:{
        goods_name:[
          {required:true,message:'请输入商品名称',trigger:'blur'}
        ],
        goods_price:[
          {required:true,message:'请输入商品价格',trigger:'blur'}
        ],
        goods_weight:[
          {required:true,message:'请输入商品重量',trigger:'blur'}
        ],
        goods_number:[
          {required:true,message:'请输入商品数量',trigger:'blur'}
        ],
        goods_cat:[
          {required:true,message:'请选择商品分类',trigger:'blur'}
        ]
      },
      // 商品分类数据
      catelist:[],
      cateProps:{
        label:'cat_name',
        value:'cat_id',
        children:'children'
      },
      // 动态参数列表数据
      manyTabDate:[],
      // 静态属性数据
      onlyTabDate:[],
      // 上传图片的URL地址
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj:{
        Authorization:sessionStorage.getItem('token')
      },
      previewPath:'',
      // 图片预览对话框的显示与隐藏
      previewVisible:false
    }
  },
  created() {
    // 获取商品分类数据
    this.getCateList();
  },
  methods:{
    // 获取商品分类数据
    async getCateList() {
      const {data:res} = await this.$http.get('categories');
      if(res.meta.status!==200) {
        return this.$message.error('获取商品分类数据失败!')
      }
        this.catelist=res.data
        // console.log(this.catelist);
    },
    // 级联选择器选中项发生变化 会触发这个函数
    handleChange() {
      if(this.addForm.goods_cat.length!==3) {
        this.addForm.goods_cat=[];
      }
    },

    beforeTabLeave(activeName,oldActiveNmae) {
      if(oldActiveNmae ==='0' && this.addForm.goods_cat.length!==3) {
        this.$message.error('请先选择商品分类');
        return false;
      }
    },
    // tab栏点击 触发这个函数
    async tabClicked() {
      // 证明访问的是动态参数面板
      if(this.activeIndex==='1') {
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
      if(res.meta.status!==200) {
        this.$message.error('获取动态参数列表失败!')
      }
      res.data.forEach(item=>{
        item.attr_vals=item.attr_vals.length==0 ? []:item.attr_vals.split(' ');
      })
      console.log(res.data);
      this.manyTabDate=res.data
      }else if(this.activeIndex==='2') {
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
        if(res.meta.status!==200) {
          this.$message.error('获取静态属性列表失败!')
        }
          this.onlyTabDate=res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath=file.response.data.url;
      this.previewVisible=true
    },
    // 处理图片移除效果
    handleRemove(file) {
      // 1.获取将要删除的图片的临时路经
      const filePath=file.response.data.tmp_path;
      // 2.从pics数组中,找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x=>{
        x.pic===filePath
      });
      // 调用数组的splice方法 把图片信息对象 从pics数组中移除
      this.addForm.pics.splice(i,1);
      console.log(this.addForm);
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // 拼接得到一个图片信息对象
      const picsInfo={pic:response.data.tmp_path}
      // 将图片信息对象push到pics数组中
      this.addForm.pics.push(picsInfo)
      // console.log(this.addForm.pics);
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async valid=>{
        if(!valid) {
          return this.$message.error('请添加必要的商品信息!');
        }
          // 添加商品的业务逻辑
          const form = _.cloneDeep(this.addForm)
          form.goods_cat= form.goods_cat.join(',');
          // 处理动态参数
          this.manyTabDate.forEach(item=>{
            const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')};
            this.addForm.attrs.push(newInfo)
          })
          // 处理静态属性
          this.onlyTabDate.forEach(item=>{
            const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals};
            this.addForm.attrs.push(newInfo)
          })
          form.attrs=this.addForm.attrs
          // console.log(form);
          // 发起添加商品的请求
          // 商品的名称必须是唯一
          const {data:res} = await this.$http.post('goods',form)
          if(res.meta.status!==201) {
            this.$message.error('添加商品失败!')
          }
            this.$message.success('添加商品成功');
            this.$router.push('/goods')
      })
    }

  },
  computed:{
    cateId() {
      if(this.addForm.goods_cat.length===3) {return this.addForm.goods_cat[2]}
      return null;
    }
  }
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.addBtn {
  margin-top: 10px;
}
</style>